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Title: Energy-efficient regenerative liquid desiccant drying process

This invention relates to the use of desiccants in conjunction with an open oop drying cycle and a closed loop drying cycle to reclaim the energy expended in vaporizing moisture in harvested crops. In the closed loop cycle, the drying air is brought into contact with a desiccant after it exits the crop drying bin. Water vapor in the moist air is absorbed by the desiccant, thus reducing the relative humidity of the air. The air is then heated by the used desiccant and returned to the crop bin. During the open loop drying cycle the used desiccant is heated (either fossil or solar energy heat sources may be used) and regenerated at high temperature, driving water vapor from the desiccant. This water vapor is condensed and used to preheat the dilute (wet) desiccant before heat is added from the external source (fossil or solar). The latent heat of vaporization of the moisture removed from the desiccant is reclaimed in this manner. The sensible heat of the regenerated desiccant is utilized in the open loop drying cycle. Also, closed cycle operation implies that no net energy is expended in heating drying air.
Authors:
 [1] ;  [1] ;  [2]
  1. (Huntsville, AL)
  2. (Athens, AL)
Publication Date:
OSTI Identifier:
863510
Report Number(s):
US 4189848
DOE Contract Number:
E(40-1)-5157
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
energy-efficient; regenerative; liquid; desiccant; drying; process; relates; desiccants; conjunction; oop; drying; cycle; closed; loop; drying; cycle; reclaim; energy; expended; vaporizing; moisture; harvested; crops; closed; loop; cycle; drying; air; brought; contact; desiccant; exits; crop; drying; bin; water; vapor; moist; air; absorbed; desiccant; reducing; relative; humidity; air; air; heated; desiccant; returned; crop; bin; loop; drying; cycle; desiccant; heated; fossil; solar; energy; heat; sources; regenerated; temperature; driving; water; vapor; desiccant; water; vapor; condensed; preheat; dilute; wet; desiccant; heat; added; external; source; fossil; solar; latent; heat; vaporization; moisture; removed; desiccant; reclaimed; manner; sensible; heat; regenerated; desiccant; utilized; loop; drying; cycle; closed; cycle; operation; implies; net; energy; expended; heating; drying; air; moist air; sensible heat; heat sources; latent heat; relative humidity; closed loop; closed loop; water vapor; water vapor; water vapor; solar energy; heat source; external source; closed cycle; net energy; energy heat; drying process; drying cycle; drying cycle; drying cycle; drying cycle; liquid desiccant; oop drying; oop drying; oop drying; oop drying /34/126/